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  Subjects -> CHEMISTRY (Total: 843 journals)
    - ANALYTICAL CHEMISTRY (51 journals)
    - CHEMISTRY (594 journals)
    - CRYSTALLOGRAPHY (21 journals)
    - ELECTROCHEMISTRY (25 journals)
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ANALYTICAL CHEMISTRY (51 journals)

Showing 1 - 51 of 51 Journals sorted alphabetically
Accounts of Chemical Research     Full-text available via subscription   (Followers: 163)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 30)
American Journal of Analytical Chemistry     Open Access   (Followers: 32)
Analytica Chimica Acta     Hybrid Journal   (Followers: 37)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 30)
Analytical and Bioanalytical Chemistry Research     Open Access  
Analytical Chemistry     Full-text available via subscription   (Followers: 262)
Analytical Chemistry Insights     Open Access   (Followers: 23)
Analytical Chemistry Research     Open Access   (Followers: 8)
Analytical Letters     Hybrid Journal   (Followers: 11)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 11)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 11)
Biomonitoring     Open Access   (Followers: 2)
Chemical Data Collections     Hybrid Journal  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 4)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 3)
Composites Communications     Full-text available via subscription   (Followers: 1)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 6)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 27)
Current Analytical Chemistry     Hybrid Journal   (Followers: 9)
Drug Testing and Analysis     Hybrid Journal   (Followers: 7)
Electroanalysis     Hybrid Journal   (Followers: 8)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 5)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 3)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription   (Followers: 1)
International Journal of Analytical Chemistry     Open Access   (Followers: 22)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 3)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 7)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 7)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 11)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 23)
Journal of Combinatorial Chemistry     Full-text available via subscription   (Followers: 1)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 6)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 3)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 6)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 24)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 2)
Microchemical Journal     Hybrid Journal   (Followers: 4)
Nigerian Journal of Chemical Research     Full-text available via subscription   (Followers: 2)
Phytochemical Analysis     Hybrid Journal   (Followers: 3)
Polish Journal of Chemical Technology     Open Access   (Followers: 2)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 11)
Sample Preparation     Open Access   (Followers: 1)
Surface and Interface Analysis     Hybrid Journal   (Followers: 15)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 56)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 3)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 14)
World Journal of Analytical Chemistry     Open Access   (Followers: 2)
Journal Cover Journal of Analytical Chemistry
  [SJR: 0.268]   [H-I: 23]   [23 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2352 journals]
  • Group formation and choice of standard substances in the determination of
           total concentrations of similar compounds as total indices
    • Authors: V. I. Vershinin
      Pages: 947 - 956
      Abstract: Abstract Determination of the total concentration (с Σ) of similar organic compounds as an total index (TI), expressed in terms of a standard substance of Xst, is a widely used but poorly studied type of chemical analysis. The main problem is the inaccuracy of estimate с Σ. The article considers reasons for the appearance of systematic errors, rules of formation of groups of simultaneously determined compounds, and the choice of Xst. A classification of TI taking into account the nature of Xst is proposed. To improve the accuracy of analysis, it is expedient to simultaneously use of several standards and construct multivariate calibration dependences.
      PubDate: 2017-09-01
      DOI: 10.1134/s1061934817090131
      Issue No: Vol. 72, No. 9 (2017)
       
  • Dispersive magnetic solid phase extraction using octadecyl coated silica
           magnetite nanoparticles for the extraction of tetracyclines in water
           samples
    • Authors: Watchara Kaewsuwan; Proespichaya Kanatharana; Opas Bunkoed
      Pages: 957 - 965
      Abstract: Abstract Magnetite nanoparticles coated with silica and hydrophobic octadecyl layers were successfully synthesized and used in magnetic solid phase extraction of tetracyclines from water samples. The magnetite nanoparticles facilitated a convenient magnetic separation of sorbent from an aqueous sample, the octadecyl layer helped to enhance the adsorption ability and the silica layer helped to prevent the aggregation of the magnetite nanoparticles. The effect of various parameters on the extraction efficiency were optimized including the amount of sorbent, sample pH, stirring rate, extraction time and desorption conditions. Under the optimum conditions, the recoveries were in the range of 82 to 88%, the calibration curves were linear over the concentration range of 0.002 to 1.0 μg/mL for oxytetracycline and 0.01 to 1.0 μg/mL for tetracycline and chlortetracycline, respectively. The developed method had several advantages such as simplicity, convenience, cost-effectiveness and high extraction efficiency.
      PubDate: 2017-09-01
      DOI: 10.1134/s1061934817090143
      Issue No: Vol. 72, No. 9 (2017)
       
  • Voltammetric determination of perchlorate ion at a liquid–liquid
           microscopic interface
    • Authors: L. Yu. Martynov; A. P. Mel’nikov; A. A. Astaf’ev; N. K. Zaitsev
      Pages: 992 - 998
      Abstract: Abstract A method is proposed for the electrochemical determination of perchlorate ion by voltammetry at the interface between two immiscible phases (water–o-nitrophenyl octyl ether). A demountable original-design amperometric ion-selective electrode based on a laser-microperforated polymeric membrane was fabricated for voltammetric measurements. The conditions of analytical signal recording in the determination of ClO4 − were determined. The effect of interfering ions was assessed and amperometric selectivity coefficients were calculated. The accuracy of the procedure was verified by the added–found method. The developed electrode was applied to the determination of perchlorate in natural and drinking waters.
      PubDate: 2017-09-01
      DOI: 10.1134/s1061934817090052
      Issue No: Vol. 72, No. 9 (2017)
       
  • Determination of triacylglycerols of manketti oil by reversed-phase HPLC
    • Authors: An Nguen Van; A. A. Popova; V. I. Deineka; L. A. Deineka
      Pages: 1007 - 1012
      Abstract: Abstract Using reversed-phase HPLC with refractometric detection, we determined the composition of triacylglycerols (TAGs) of manketti oil and calculated its fatty acid composition. It was shown that the oil consists of octadecatrienoic (34.6 ± 0.8 mol %), linoleic (35.4 ± 0.8 mol %), oleic (14.6 ± 0.4 mol %), palmitic (7.2 ± 0.3 mol %), and stearic acids. Using spectrophotometric detection, for the oils of centrathus and jacaranda seeds, it was demonstrated that octadecatrienoic acid is presented mainly by α-eleostearic acid and small impurities of β-eleostearic (2.8 mol %) and jacarandic (0.3 mol %) acids. The results of the quantitative determination of TAGs, obtained by refractometric detection (with corrections of the peak areas to the calculated values of the refractive indices of TAGs), are consistent with the data obtained using spectrophotometric detection.
      PubDate: 2017-09-01
      DOI: 10.1134/s1061934817090027
      Issue No: Vol. 72, No. 9 (2017)
       
  • Determination partition coefficients of volatile organic substances in the
           system liquid–air for the creation of calibration gas-phase samples with
           trace concentrations of substances
    • Authors: A. O. Malysheva; M. N. Baldin; V. M. Gruznov
      Pages: 1013 - 1017
      Abstract: Abstract The results of determination of Henry’s coefficients for an equilibrium vapor containing trace concentrations of acetone, benzene, toluene, and xylenes over their aqueous solutions are presented. Continuous gas extraction is used.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100112
      Issue No: Vol. 72, No. 10 (2017)
       
  • Using a switchable-hydrophilicity solvent for the
           extraction−spectrophotometric determination of nickel
    • Authors: Y. Bazel’; M. Reclo; J. Šandrejová
      Pages: 1018 - 1023
      Abstract: Abstract A procedure was developed for the extraction and preconcentration of nickel as its dimethylglyoxime complex using triethylamine. Triethylamine on exposure to CO2 changes its hydrophilicity and converts into a polar water-miscible form. The separation of the extractant was achieved by adding a concentrated alkaline solution to the extraction mixture. The nickel-enriched triethylamine extract was separated and evaporated, the residue was dissolved in chloroform (50 μL), and absorbance at 380 nm was measured. Conditions for the determination of nickel (pH of the medium, concentrations of dimethylglyoxime and NaOH, type and volume of dispersive solvent, ultrasonic exposure, stirring time) were optimized. A procedure for the spectrophotometric determination of nickel with a limit of detection of 0.020 μg/mL (n = 10; P = 0.95) was developed. The linearity range was from 0.050 to 0.60 μg/mL. Most of nickel-related ions (Fe3+, Fe2+, Co2+, Cu2+, Zn2+, Cd2+, Pb2+, Hg2+) do not interfere with its determination. The procedure was applied to the analysis of water samples.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817080032
      Issue No: Vol. 72, No. 10 (2017)
       
  • Catalytic spectrophotometric determination of trace amount of cerium(IV)
    • Authors: Qing-Zhou Zhai; Wei-Hua Hu; Zhong Chai
      Pages: 1024 - 1027
      Abstract: Abstract Based on a property that in dilute hydrochloric acid hydrogen peroxide oxidizes Ponceau S to fade and cerium(IV) has a catalytic effect on the reaction, a new spectrophotometric method was developed for the determination of trace cerium(IV). At 450 nm, the cerium(IV) concentration presents a good linear relationship over the range of 0.08‒4 μg/mL with the fading degree ΔA. Its linear regression equation is ΔA = 0.0475c (μg/mL) + 0.0007, with a correlation coefficient of 0.9991. The detection limit of method is 0.05 μg/mL. The method has been successfully applied to the determination of cerium in water and molecular sieve samples with good results. The relative standard deviations of eleven determinations were 0.97‒1.11 and 0.19‒1.01%, respectively. The recoveries of standard additions were 99.4‒99.9 and 99.2‒101.0%, respectively. The reliability of this method was certified by parallel determination against the dibromo-p-chlorochlorophosphonazo spectrophotometry.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100148
      Issue No: Vol. 72, No. 10 (2017)
       
  • Determination of novobiocin by a kinetic spectrophotometric method in milk
           and biological samples
    • Authors: Mohsen Keyvanfard; Khadijeh Alizad; Nazila Najjarian
      Pages: 1028 - 1033
      Abstract: Abstract A new, simple, inexpensive, and fast kinetic spectrophotometric method was developed for the determination of trace amounts of antibiotic drug novobiocin sodium over the range of 4‒32 ng/mL. The method is based on the inhibitory effect of novobiocinon the reaction of Amido Black and periodate in the acidic micellar mediums. The reaction was monitored spectrophotometrically by measuring the decrease in absorbance at 627 nm and fixed-time 6 min from initiation of the reaction. The detection limit is 3 ng/mL, and relative standard deviation for 4.8 and 12 ng/mL novobiocin were 0.52 and 0.65%, respectively, for six replicate measurements. The method was applied to the determination of novobiocin in human and dog serum, urine, and milk samples.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100124
      Issue No: Vol. 72, No. 10 (2017)
       
  • Exploration of antioxidant activity of newly synthesized azo flavones and
           its correlation with electrochemical parameters along with the study of
           their redox behaviour
    • Authors: A. Kumar; P. Sharma; P. K. Sharma
      Pages: 1034 - 1044
      Abstract: Abstract A series of 7-hydroxy-2-aryl-3-(2-aryldiazenyl)-4H-chromen-4-one derivatives was synthesized in quantitative yields. Herein, we demonstrate the antioxidant potential of the synthesized substituted azo flavones using 1,1-diphenyl-2-picryl-hydrazyl assay method along with the evaluation of their redox behaviour by cyclic voltammetry. The synthesized compounds manifested good antioxidant potential as compared to standard antioxidant ascorbic acid, which especially pertains to the compounds having methoxy and hydroxyl groups. A good correlation between minimum inhibitory concentration (IC50) and deduced electrochemical parameter, i.e., half peak oxidation potential (E p/2) values, was established.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100094
      Issue No: Vol. 72, No. 10 (2017)
       
  • Electrocatalytic determination of penicillamine using multiwall carbon
           nanotubes paste electrode and chlorpromazine as a mediator
    • Authors: Mohsen Keyvanfard; Nazila Najjarian; Khadijeh Alizad
      Pages: 1045 - 1050
      Abstract: Abstract In this study, we describe the application of carbon paste electrode modified with multiwall carbon nanotubes as a voltammetric sensor for determination of penicillamine (PA) in the presence of chlorpromazine as a mediator. This modified electrode showed very efficient electrocatalytic activity for the anodic oxidation of PA. The peak current of linear sweep voltammograms of PA increased linearly with it’s concentration in the range of 0.5–500 μM PA. The detection limit for PA was 0.2 μM. The RSDs for 1.0 and 10.0 μM PA were 1.1 and 1.7%, respectively. The proposed sensor was successfully applied for the determination of PA in human urine and tablet.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100136
      Issue No: Vol. 72, No. 10 (2017)
       
  • Titrimetric determination of maleinimide and acrylate groups in organic
           compounds
    • Authors: S. N. Lysenko; S. Yu. Ivanenko; S. A. Astaf’eva; R. M. Yakushev
      Pages: 1051 - 1056
      Abstract: Abstract A simple procedure is proposed for determining the concentration of maleimide and acrylate groups in organic compounds based on the addition of morpholine to the activated double bond by the Michael reaction, followed by the potentiometric titration of the reaction mixture with 1 M HCl in ethanol. The applicability of the method to N-substituted maleimides with aromatic, aliphatic, and oligomeric substituents, as well as to acrylates and acrylonitrile, is verified. It is demonstrated that maleimides and acrylates can be determined simultaneously.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100100
      Issue No: Vol. 72, No. 10 (2017)
       
  • Determination of Meldonium in human urine by HPLC with tandem mass
           spectrometric detection
    • Authors: A. A. Azaryan; A. Z. Temerdashev; E. V. Dmitrieva
      Pages: 1057 - 1060
      Abstract: Abstract A procedure is proposed for determining Meldonium in human urine, including sample preparation to analysis and analyte determination by HPLC with tandem mass spectrometric detection. For sample preparation, the procedure of “dilute-and-shoot” was used. The lower limit of the analytical range is 10 ng/mL; the limit of detection is 7.5 ng/mL; and the linearity range is 10–250 ng/mL. The proposed procedure is tested on real samples obtained from volunteers. A possibility of the direct analysis of urine samples after dilution is demonstrated; the limit of detection is 20 ng/mL. The high sensitivity of the procedure ensures its use for the determination of Meldonium in clinical diagnosis and doping control.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100033
      Issue No: Vol. 72, No. 10 (2017)
       
  • Systematization of the results of the chromatography–mass spectrometry
           identification of the products of quercetin oxidation by atmospheric
           oxygen in aqueous solutions
    • Authors: I. G. Zenkevich; T. I. Pushkareva
      Pages: 1061 - 1075
      Abstract: Abstract The coordination of the results of different works for the systematization of the structures of products previously detected in the complex samples is an important stage in the interpretation of the results of the identification of the components of complex samples of natural origin by chromatography–mass spectrometry with the low reproducibility of their mass spectra under the conditions of electrospray ionization and limited reference information. The data processing of this kind was carried out for the products of the oxidation of the most common natural flavonoid quercetin (3,5,7,3',4'-pentahydroxyflavone) by atmospheric oxygen in weakly alkaline aqueous alcohol solutions. For the correlation of peaks in chromatograms with the structures of oxidation products, their reversed-phase HPLC retention indices in the scale of reference n-alkyl phenyl ketones were determined for the first time. It was confirmed that not all of the oxidation products are stable in solution; some of them can accumulate or disappear during the storage of the samples.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817080147
      Issue No: Vol. 72, No. 10 (2017)
       
  • Determination of ametoctradin in plant residues and environmental samples
           by HPLC with an UV detector
    • Authors: A. S. Komarova; T. D. Chermenskaya; V. V. Chelovechkova
      Pages: 1076 - 1081
      Abstract: Abstract The study deals with the development of a method for the determination of ametoctradin by HPLC with UV detection. Samples were extracted with aqueous acetone and then purified by distribution between immiscible solvents and also on solid-phase extraction cartridges. The procedure was tested in the determination of ametoctradin in water in the range 0.001–0.01 mg/L, in soil, potato vine and potato tubers, salad, onion, cucumber, tomatoes, carrots, grapes, and grape juice in the range from 0.005 to 0.1 mg/kg, depending on the matrix. The average recoveries were 78−92% with RSD < 0.08%. The proposed procedure is applicable to the determination of ametoctradin in environmental samples and plant residues.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100082
      Issue No: Vol. 72, No. 10 (2017)
       
  • Peculiarities of gas chromatographic analysis of 6N4 volatile hydrides
           using a helium ionization detector operated in the ionization
           amplification mode
    • Authors: A. I. Skosyrev; G. V. Pushkarev; S. V. Ermolaev; D. M. Polezhaev; A. K. Chernyatin
      Pages: 1082 - 1088
      Abstract: Abstract A pneumovacuum circuit of a Tsvet-800-2 gas chromatograph with a helium ionization detector (HID) in the ionization amplification mode is proposed for controlling limiting trace impurities in ammonia, arsine, monosilane, and phosphine of grade 6N4. The conditions for the preparation and reliable operation of the chromatograph with the HID are systematized. The effect of an additive of (0.0–17.6) × 10–4 mol % of hydrogen in the carrier gas of the detector on the polarity of its signal on the impurities of oxygen and nitrogen at a level of (0.5–20.0) × 10–5 mol % is studied. Methods are proposed for eliminating systematic errors in the determination of the concentration of oxygen and nitrogen in the range from 0.5 × 10–5 to 1 × 10–3 mol % in 6N4 volatile hydrides, caused by “counter” impurities in the carrier gas, the mechanism of the heteropolar sensitivity of the HID, and irreversible chemical reactions of oxygen traces with phosphine and products of its decomposition on a CaA–ShM zeolite in a separating column of a chromatograph. Gas chromatography analysis of ammonia, arsine, monosilane, and phosphine of grade 6N4 was carried out.
      PubDate: 2017-10-01
      DOI: 10.1134/s106193481710015x
      Issue No: Vol. 72, No. 10 (2017)
       
  • Gas-chromatographic separation of enantiomers of 2-chlorobutane and
           2-bromobutane on a cyanuric acid-modified Carboblack C adsorbent
    • Authors: V. Yu. Gus’kov; D. A. Sukhareva; I. V. Arslanova; D. E. Musabirov
      Pages: 1089 - 1094
      Abstract: Abstract The enantiomers of 2-chlorobutane and 2-bromobutane were separated by gas chromatography on a Carboblack C adsorbent modified by 10% cyanuric acid. Upon thorough mechanical stirring of a solution, cyanuric acid was shown to form chiral supramolecular structures on the surface of adsorbent particles analogously to the Kondepudi formation of chiral crystals of achiral molecules. The enantiomers of 2-bromobutane and 2-chlorobutane were found to undergo, respectively, complete and partial separation on the cyanuric acid-modified Carboblack C adsorbent. The separation of enantiomers is due to a high enantioselectivity of the modified adsorbent. The analysis of thermodynamic functions of adsorption showed that the differences in specific retention volumes of enantiomers are caused by the fact that one of enantiomers is adsorbed predominantly within the cavity of the supramolecular structure of cyanuric acid and another one is adsorbed on its surface. Separation on the proposed chiral stationary phase is characterized by the relative standard deviation of retention volumes no more than 7%.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100069
      Issue No: Vol. 72, No. 10 (2017)
       
  • Determination of individual sulfur-containing compounds in gas condensate
           and petrol by gas chromatography
    • Authors: I. P. Afanas’ev; T. A. Gorshkova; S. A. Arystanbekova; M. S. Lapina; A. B. Volynskii
      Pages: 1095 - 1101
      Abstract: Abstract A procedure is developed for the determination of more than 60 individual sulfur-containing compounds (SCC) in liquid hydrocarbon raw materials and in liquid fuels using gas chromatography on a 25-m WCOT column, inner diameter 0.32 mm, with a nonpolar dimethylpolysiloxane stationary phase (layer thickness 5 μm) and chemiluminescence detection. SCC were identified by individual standard substances and published data. Quantitative determination was carried out by the internal standard method. The results of determination of individual SCC in petrol and stable gas condensate are presented. The most high-boiling SCC found in significant amounts (more than 0.005 wt % of sulfur) were C2-benzothiophenes (in petrol) and C4-dibenzothiophenes (in gas condensate).
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100021
      Issue No: Vol. 72, No. 10 (2017)
       
  • Determination of muscular tissue proteins by 2D electrophoresis and
           time-of-flight mass spectrometry
    • Authors: N. L. Vostrikova; A. V. Kulikovskii; I. M. Chernukha; L. I. Kovalev; S. A. Savchuk
      Pages: 1102 - 1112
      Abstract: Abstract A procedure is developed for the determination of meat proteins by two-dimensional electrophoresis (2D). The procedure is intended for the quantitative determination of muscle proteins in samples of meat raw materials by a complex of proteomic technologies, including 2D-electrophoresis in a polyacrylamide gel and computer densitometry of the recorded electropherograms.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100173
      Issue No: Vol. 72, No. 10 (2017)
       
  • Comparative study of methods for evaluating the mobility of element
           species in contaminated soil and technogenic sand under batch and dynamic
           extraction
    • Authors: B. V. Dampilova; P. S. Fedotov; R. Kh. Dzhenloda; N. N. Fedunina; V. K. Karandashev
      Pages: 1113 - 1119
      Abstract: Abstract A comparative study of the batch and dynamic extraction methods used to evaluate the physicochemical “mobility” of element species in environmental samples was carried out using samples of contaminated soils and technogenic sands of the Dzhida Tungsten–Molybdenum Factory. In determining the total concentration of mobile species of Cu, Zn, Pb, Cd, Mn, and Mo, they were extracted with an acetate–ammonium buffer solution (pH 4.8) in the batch mode. Fractionation of the most mobile and environmentally relevant element species, that is, exchange and acid-soluble, was carried out in a dynamic extraction mode in a rotating coil column using calcium nitrate and acetic acid. Element concentrations in the initial samples and extracts were determined by inductively coupled plasma atomic emission spectrometry and mass spectrometry. It is shown that the concentrations of mobile species of Cd, Mn, and Mo, isolated with an acetate–ammonium buffer solution, correspond to the sum of these elements in the exchange and acid-soluble fractions, while the concentration of lead in the acetate–ammonium extract is 2–4 times higher. The convergence of the results of dynamic and batch extraction of copper and zinc depends on the type of sample: for sand, the results are in satisfactory agreement, while for soil, the concentration of copper and zinc in the acetate–ammonium extract is 2–4 times lower than their concentration in the exchange and acid-soluble forms. Nevertheless, the data obtained confirm that the conventional method of batch extraction with an acetate–ammonium buffer solution (pH 4.8) can be considered acceptable for the rapid assessment of the physicochemical mobility and potential bioavailability of elements in soil and technogenic sand. For a more detailed study of highly contaminated samples and the assessment of their danger to the environment, it is advisable to separate exchange and acid-soluble fractions.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100045
      Issue No: Vol. 72, No. 10 (2017)
       
  • On the limitation of the term petroleum products in the determination of
           the oil pollution of bottom sediments
    • Authors: Z. A. Temerdashev; L. F. Pavlenko; I. G. Korpakova; G. V. Skrypnik; T. L. Klimenko; T. V. Votinova; Ya. S. Ermakova
      Pages: 1120 - 1125
      Abstract: Abstract Problems related to the determination of the oil pollution of bottom sediments are discussed. Tarry substances resistant to degradation, whose content can be as high as 50% on a total oil basis, are accumulated in the bottom sediments. The conventional term petroleum products, which implies only a hydrocarbon fraction, does not adequately describe these substances; because of this, the really evaluated level of the oil pollution of bottom sediments becomes underestimated to a considerable degree. We proposed to determine tarry substances in bottom sediments by fluorescence spectrometry at 490–510 nm in combination with a stage of the chromatographic preconcentration and separation of oils and petroleum products into the following main group components: hydrocarbons, tars, and asphaltenes. The substances coextracted with the petroleum products (pesticides, phenols, pigments, etc.) occurred in a chromatographic zone of tars and asphaltenes, but they fluoresce at other wavelengths and do not interfere with the determination. The typical chromatograms of hydrocarbons from the bottom sediments of different water bodies obtained by gas chromatography are given.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061934817100161
      Issue No: Vol. 72, No. 10 (2017)
       
 
 
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